chore(elasticache): enhance service and checks

[MrCloudSec]

Description

Enhance AWS Elasticache service and checks since the clusters in the API are either Memcached Clusters or Redis Nodes, and the Replication Groups are Redis Clusters.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 82.14286% with 10 lines in your changes missing coverage. Please review.

Project coverage is 87.08%. Comparing base (ba726b2) to head (fef187e). Report is 501 commits behind head on master.

Files with missing lines	Patch %	Lines
...rs/aws/services/elasticache/elasticache_service.py	69.69%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4329      +/-   ##
==========================================
- Coverage   87.09%   87.08%   -0.02%     
==========================================
  Files         848      848              
  Lines       26486    26492       +6     
==========================================
+ Hits        23069    23071       +2     
- Misses       3417     3421       +4     

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[MrCloudSec]

Thanks for the review @jfagoagas , loved the ideas!